File name: AK_ENSO_correlation_precip.jpg
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Relationship between the Oceanic Niño Index (ONI) and precipitation departures by season for all years between 1925 and 2022 using a trailing 30-year climatology. The darker the color, the stronger the connection. Positive correlation (green) means ONI and precipitation vary in the same direction: precipitation is higher when ONI is higher (El Niño) and lower when ONI is lower (La Niña). Negative correlation (purple) means ONI and precipitation vary in opposite directions: precipitation is lower when ONI is higher (El Niño) and higher when ONI is lower (La Niña). Images by Brian Brettschneider, using Oceanic Niño Index values based on Climate Prediction Center methods and Alaska temperature departures from NCEI’s Climgrid data.